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post #4 of Old 12-05-2012
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Location: Kingston Washington
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Re: Prop shaft material

The stainless normally used is 304 and at 1 1/4 diameter that should be well strong enough with a safety factor well over three. A more common material is tobin bronze which has about the same yield strength but is more elastic. High strength alloys include Aquamet 22, 18 and 17; Monel 400 and K500 But they're overkill for your situation. more for special situations.

Walt Elliott
Kingston WA
Puget Sound
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